First, how to deal with Vibrio in the shrimp pond?
1, vibrios are generally produced on the bait, feces and dead algae left at the bottom of the pond. These wastes are the main source of Vibrio in water, so it is necessary to thoroughly disinfect the pond and cut off the source of Vibrio. Potassium hydrogen persulfate can be used for chemical bottom modification, which has strong oxidation, can decompose strongly oxidizing atomic oxygen and strongly oxidizing hydrogen peroxide (the main component of hydrogen peroxide) in water, kill benthic Vibrio, oxidize the bait feces left at the bottom, and provide no growth environment for Vibrio.
2. When changing the bottom of the pool, it must be changed twice in a row. At night, 20% potassium persulfate can be used to dry the pond to kill Vibrio at the bottom of the pond. Generally, the bottom of the pool is prone to hypoxia at night, when Vibrio is in the rapid breeding period. Potassium persulfate can also release oxygen in the process of sterilization and disinfection, and improve the dissolved oxygen at the bottom of the pool.
3. When shrimp is found to have atrophy and redness of liver and pancreas, and blisters appear at the tail, the water body must be disinfected immediately. 50% potassium persulfate can be disinfected continuously for about 2 days 1 every 24 hours after disinfection 1 time. Oral administration of nano-silver while stirring can kill Vibrio in shrimp. It can be used twice in 1 day for 5 days, and then stopped for 5 days, which can reduce the Vibrio content in shrimp.
Second, what is the role of Vibrio shrimp in the shrimp pond?
1, Vibrio harveyi: it is easy to make shrimp suffer from fluorescent disease, and the activity of young shrimp will be weakened at the initial stage of the disease, and it will also make the mysid shrimp and young shrimp rebound weakly; Young shrimp will eat little or no food, young shrimp will turn pale, and dying or dead young shrimp will glow. Vibrio parahaemolyticus: It can make shrimp suffer from premature death syndrome. Vibrio alginolyticus: It can make shrimp seedlings suffer from bacteremia, polycythemia, white spot disease and other diseases.
2. When many fry are put into the pond, they will carry Vibrio themselves. Therefore, shrimp farmers should first use Vibrio culture medium to detect whether Vibrio in shrimp seedlings exceeds the standard, and choose healthy shrimp seedlings without Vibrio for stocking. If it is in the parent shrimp or shrimp seedling stage, it is easy to be infected with vibriosis, which not only directly endangers the survival of the parent shrimp, but also affects the development of fertilized eggs and larvae and the health of shrimp seedlings. At this time, Vibrio can not only parasitize in the liver, blood and muscle of parent shrimp, but also infect nauplii through heredity, which has the characteristics of great destructive power, strong infectivity and far-reaching harm.
3. The adaptive temperature of Vibrio is about 10-35℃, and the optimal temperature is about 25℃ ... Vibrio is an anaerobic bacterium. When the aquaculture water environment is bad and the bottom material deteriorates, a large number of vibrios will multiply at the bottom. Under anaerobic conditions, the bottom of the pond will be decomposed by some ammonifying bacteria and sulfide bacteria to produce a large number of harmful components such as ammonia nitrogen and hydrogen sulfide, and the geothermal temperature will be relatively high. At this time, Vibrio can get enough nutrition and multiply quickly.